Discussion
What is the radiation efficiency of an antenna?
Answer: D
Radiation efficiency is the fraction of the accepted power that leaves as radiation rather than being dissipated in conductor and dielectric loss, and in circuit terms it is the radiation resistance divided by the sum of radiation and loss resistances. Referring to available rather than accepted power folds in the mismatch, which is a separate factor. Aperture illumination uniformity is aperture efficiency, a distinct quantity affecting directivity rather than loss.
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